Illuminator for surveying instruments.



N0.72'a,a57. I PATENTED MAY 19, 1903.

'10. M. BERNEGAU.

I'LLUMINATOR FOR SURVEYING INSTRUMENTS. APPLICATION FILED MAR. 20, 1902.

K0 MODEL.

WITN'EEEEEJA INEVENTEJQ M0772. W

No. 728,357.. f

UNITED CARL M. BERNEGAU, OF HOBOKEN, NEW JERSEY, ASSIGNOR TO KEUFFEL 85 STATES Patented May 19, 1903.

ESSER COMPANY, A CORPORATION OF NEW JERSEY.

ILLUMINATOR FOR SURVEYING INSTRUMENTS.

SFEGIFICATIONfOrming part of Letters Patent No. 728,357, dated May 19, 1903.

Application filed March 20, 1902. Serial No. 99,050. (No model.)

To all whom it may concern: I

Be it known that I, CARL M. BERNEGAU, a citizen of the United States, residing at 110- boken, in the county of Hudson and State of Newv Jersey, have invented certain new and useful Improvements in Illuminators for Surveying Instruments and the Like, of which the following is a specification.

My invention relates to illuminators for so rveying instruments and the like; and its novelty consists in the construction and adaptation of the parts, as will be more fullyhereinafterpointed out.

Surveyors, and especially those whose work relates to mining operations, when they take their instruments into a badly-lighted placefor instance, in a mine-tunnel, in. a dense forest, or at nightare often nearly if not quite unable to read the fine graduations on the Vernier or even the coarser graduations of a regularly-divided scale, are, or tape.

The object of my invention is to overcome this difficulty by providing an illuminator which may be conveniently carried and readily used under such circumstances; and, in brief, my invention consists of a miniature electric lamp, a portable holder therefor, a

reflector adapted to concentrate the rays of light from the lamp within alimited field, and a lens of which the focus is practically within the same field, so that the desired readings maybe made quickly, accurately, and easily, being both illuminated and magnified. A source of power and means for intermitting the same also form a part of the equipment- In the drawings, Figure l is a longitudinal rear elevation of my improved device. Fig.

.Z-is a longitudinal front elevation thereof.

Fig. 3 is a side View with parts broken away to show concealed parts. Fig. 4C is a detail of the reflector. Fig. 5 is a detail of the lens. The same numerals refer to the same parts in all of the figures. r

In the drawings, 1 is an electric lamp of small size and provided with the usual globe 2, base-plate 3, and suitable electrical connections and differing in no wise from the commercial lamp except in size.

4is a switch consisting of a flat plate of metal, secured to the back of the holder 5 by means of a screw 6 and provided with .a knob 7, which when depressed brings the switch in contact with an electrical conductor conglows when this connection is made. The

elasticity of the plate causes it to spring back from contact with the electrical" conductor when the knob is not pressed, so that the lamp does not continually 'glow.-, A sliding ring 8, adapted to encircle the holder and the switch, may be used to hold the switch in contact with the conductor.

The reflector 9 consists of a sleeve of bent metal cut away on one side in front and slightly flared at the mouth- Itis burnished upon its interior surface, so as to completely reflect'the' rays of light emittedfrom the lamp, and thecurved parts do not quite come together in front, so that it forms on the whole an elastic tube, which when slid over the holder clasps the latter by its own inherent elasticity, which permits the tube to slightly expand when extended over the holder. A lens 10, provided with a circular frame 11,

andmeans, as the threaded lugs 12, by which the lens can be firmly held within the frame,

is provided with a handle 13, adapted to slide in a suitable loop 14, formed on the back of the reflector, whereby the lens may be detachably secured to the reflector. The lens is so made that it is tilted, as shown in Fig. 3, when placed in position sothat its focus is practically coincident with the illuminated field formed by the concentration of the rays of light from the lamp reflected from the interior surface of the sleeved reflector.

It will be readily understood that the lamp and reflector may be used without the lens; but the latter forms a very convenient and advantageous additionto the device.

The manner of using my device is so simple that it scarcely needs explanation. When the operator desires to use the same, he places the holder and the lamp in juxtaposition to the object to be illuminated andby pressing upon the knob 7 closes the circuit and causes the lamp to glow. He is then enabled toread the scale desired or to inspect whatever is within the field of illumination of the lamp, and if the object viewed is seen through the lens it is of course correspondingly magnified.

When it is desired to shut off the light, the pressure upon the knob 7 is relieved. This opens the circuit and the lamp no longer glows.

I have shown the device in Fig. 1 as provided with two electrical conductors terminating in insulated Wires at the rear end of the holder. These wires may of course be suitably connected with any source of electrical powerfor instance, a pocket or other battery.

A marked advantage of my device is that it enables the surveyor to hold in one hand the light and magnifier and to have the other hand free to manipulate the instrument.

What I claim as new is 1. In an illuminator, the combination of an electric lamp, a portable holder therefor, a reflector removablyclamped upon the holder,

: and a lens held in position to bring its focus practically into coincidence with that of the reflector.

2. In an illuminator for surveying instruments, the combination of an electric lamp, a portable holder therefor, a reflector removably clamped upon the holder and provided with a loop on its rear, a clamp-ring provided with a handle adapted to slide in said loop, and a lens held in the clamp-ring in position to bring its focus practically into coincidence with that of the reflector.

3. An illuminator for use with surveying instruments and the like consisting of a miniature electric lamp and portable holder therefor, a reflector mounted on the holder and adapted to concentrate the rays of light from the lamp within a circumscribed field, said reflector consisting of a sleeve made of curved metal having an interior reflecting-surface and adapted to clasp the holder by its own inherent elasticity and a lens mounted upon the holder, the focus of said lens being practically coincident with the field illuminated by the reflected rays from said lamp.

Witness my hand this 19th day of March, 1902, in the presenceof two subscribing witnesses.

CARL M. BERNEGAU.

l/Vitnesses:

STEPHEN S. NEWTON, STEPHEN J. CoX. 

